UCLA physics professor loses $10k bet about downwind kart

[GulliverFoyle]

@Jeroen_Metselaa

This is why given an unending racetrack, constant headwind, and an indestructible propeller and gearing (and some spherical cows one assumes) the yacht could accelerate indefinitely until Lorentz comes along and makes it even more complicated.

It most certainly could not. It can accelerate only until the drag from air resistance balances the velocity of the vehicle. Otherwise there would be literally zero reason to make it aerodynamic.